// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_CAST_COMMON_TRANSPORT_ENCRYPTION_HANDLER_H_
#define MEDIA_CAST_COMMON_TRANSPORT_ENCRYPTION_HANDLER_H_

// Helper class to handle encryption for the Cast Transport library.

#include <stdint.h>

#include <memory>
#include <string>

#include "base/macros.h"
#include "base/strings/string_piece.h"
#include "base/threading/non_thread_safe.h"
#include "media/cast/common/frame_id.h"

namespace crypto {
class Encryptor;
class SymmetricKey;
}

namespace media {
namespace cast {

    class TransportEncryptionHandler : public base::NonThreadSafe {
    public:
        TransportEncryptionHandler();
        ~TransportEncryptionHandler();

        bool Initialize(const std::string& aes_key, const std::string& aes_iv_mask);

        bool Encrypt(FrameId frame_id,
            const base::StringPiece& data,
            std::string* encrypted_data);

        bool Decrypt(FrameId frame_id,
            const base::StringPiece& ciphertext,
            std::string* plaintext);

        bool is_activated() const { return is_activated_; }

    private:
        std::unique_ptr<crypto::SymmetricKey> key_;
        std::unique_ptr<crypto::Encryptor> encryptor_;
        std::string iv_mask_;
        bool is_activated_;

        DISALLOW_COPY_AND_ASSIGN(TransportEncryptionHandler);
    };

} // namespace cast
} // namespace media

#endif // MEDIA_CAST_COMMON_TRANSPORT_ENCRYPTION_HANDLER_H_
